<template>
  <div>
     <ul>
      <li v-for="(item,index) in arr" :key="item">
      <span>{{item}}</span>
      <button @click="del(index)">删除</button>
      </li>
     </ul>
     <button @click="add">生成</button>
   </div>
</template>
 
<script>
export default {
  components: {},
  props: {},
  data() {
    return {
      arr: [],
    };
  },
  computed: {},
  watch: {},
  created() {},
  methods: {
    del(index){
      this.arr.splice(index, 1);
    },
    add(){
      this.arr.push(Math.floor(Math.random()* 20))
    }
  }
};
</script>

<style scoped>
     
</style>